208 



NATURE 



[April 24, 1913 



The Conquest of Bread. By P. Kropotkin. Cheap 

 edition. Pp. xvi + 2q8. (London : Chapman and Hall, 

 Ltd.) is. net. 



Elementary Experimental Dynamics for Schools. By 

 C. E. Ashford. Pp. viii + 246." (Cambridge University 

 Press.) 4s. 



Vegetation of the Peak District. By Dr. C. E. 

 Moss. Pp. x + 235 + plates. (Cambridge University 

 Press.) 12s. net. 



Die gnomonische Projektion in ihrer Anvendung 

 auf kristallographische Aufgaben. Bv Dr. H. E. 

 Boeke. Pp. iv + 54. (Berlin: Gebriider Borntraeger.) 

 3.50 marks. 



Die Rehobother Bastards und das Bastardierungs- 

 problem beim Menschen. By Dr. E. Fischer. Pp. 

 vii + 327+ 19 plates. (Jena : G. Fischer.) 16 marks. 



E. Strasburger. Das botanische Praktikum. Fiinfte 

 Auflage. By Drs. E. Strasburger and M. Koernicke. 

 Pp. xxvi + 860. (Jena: G. Fischer.) 24 marks. 



Proceedings of the London Mathematical Society. 

 Second series. Vol. xi. Pp. xlviii + 482. (London: 

 F. Hodgson.) 



IV« Conference Internationale de Gen^tique, Paris, 

 iqn. Comptes rendus et rapports. Edited by P. de 

 Vilmorin. Pp. x + 571. (Paris: Masson et Cie.) 25 

 francs. 



Elementary Practical' Mathematics. By Prof. J. 

 Perry. Pp. xiv + 335. (London: Macmillan and Co., 

 Ltd.) 6s. 



DIARY OF SOCIETIES. 



THURSDA Y, April 24. 



Royal Society, at 4.30. — (1) Protnstigmata in Ascidians ; (2) The Origin 



of the Ascidian Mouth : A. G. Huntsman.— Experiments on the Kidneys 



of the Frog: F A. Bainbidge S. H. Collins, and J. A. Menzies — 



(1) The Prohabl- Value to Bacillus coli of "Slime" Formation in Soils- 



(2) Variation in B. coli. The Production of Two Permanent Varieties' 

 from One Origiml Strain by Means of Brilliant Green : Cecil Revis. 



Royal Institution, at 3.— The Progress of Hittite Studies. II. Religious 

 Monuments of Asia Minor: Prof. T Garstang 



Society op Dyers and Colourists (London \Secrion), at 8.— The Chem- 

 istry of the Vat Dyes : E. de B. Parnett. 



Institution op F.lectrical Engineers, at 8. — Phase-Advancing : Dr. 

 G. Kapp. 



Concrete Institute, at 7.i».— Discussion on Reports of the Science Stand- 

 ing Committee on : (t) A Standard Notation for Structural Engineering 



■ZTTF ^-R' > fftm, FRIDAY, -April 25. ' " 



Royal Institution, at o.— Meroe : Four Years' Excavations of the 



Ancient Ethiopian Capital : Prof. J. Garstang. 

 Physical Society, at 5 —A Granhic Method of Optical Imagery : W. R. 



Bower.— Spectroscopic Resolution of a Graph: Dr. C V. Burton.— 



Some Experiments to Detect fl-rays from Radium-A : Dr. W. Makower 



and Dr. S. Russ. 



MONDAY, April 38. 



Royal Society of Arts, at 8.— Antiseptics and Disinfectants. II. : Dr. D. 

 SommerviHe, 



Royal Geographical Society, at 8.30.— 400th Anniversary of the Dis- 

 covery of the Pacific Ocean hy Blasco Nunez de Balboa : Sir Clements R. 

 Markham, K.C.B 



Institute of Actuaries, at 5.— An Investigation into the Effects of 

 Family and Personal Histnrvu-on the Rates of Mortality Experienced in 

 Various Classes of Life As-urance Risks, with Special Referenced Tuber- 

 culosis : E. A. Rusher and C. VV. Kenchington. 



Institution of Civil Engineers, at 8.— Law in Relation to Engineering : 

 T. F. Thomson. 



TUESDA Y, April 20. 



Royal Institution, at 3.— Recent Physiological Inquiries. I. Motion 



nd Locomotion : Prof. \V. St 

 Illuminating Engineering 



Clauses for Inclusion in a Spe> 

 Institution of Civil E 



Sec 



Y, at 730. — Discussion: Standard 

 n of Street-lighting : A. P. Trotter. 

 I. — Annual General Meeting. 



WEDNESDAY, April 30. 



Royal Society of Arts, al 8.— The Science Museum : Dr. F. G. Ogilvie 



British Astronomical Association, at 5.— The Spectra of Comets- 



Prof. A. Fowler.— A Popular Star Finder: G. F Chambers.— Seeing • 



I. W. Worthington. 



THURSDAY, May i. 

 Society, at 4.1,0.— Probable Papers ■: The Capacity for Heat of 



Metals at Differ. 



—The Transition fom the Elasl 



Robertson and G. Cook.-Studii 



2269, VOL. 91] 



Dr. E. H. Griffiths and Ezer Griffiths. 

 : to Ihe Plastic State in Mdd Steel : A. 

 of the Processes Operative in Solutions 



XXVIII. The Influence of Acids on the Rotatory Power of Cane Sugar, 

 of Glucose and of Fructose: F. P. Worley.— The Attainment of High 

 Potentials by the Use of Radium : H. G. J. Mnseley -The Decrease it. 

 Velocity of a Particles in parsing through Matter: E. Marsden and Dr. 

 T. S. Tayloi. 



Roval Institution, at 3.— The Progress of Hittite Studies. III. Cults 

 ol Northern Syria: Prof. J. Gaistang. 



Institution op' Electrical Engineers, at 8.— The Use of the Electro- 

 static System I r Ihe Measurement of Power : C. C. Paterson, E. H. 

 Rayner, and A Kinnes. 



Linnean Society, at 8.— The Structure of the Wood of East Indian 

 Species of Pinus : Prot. P. Groom and W. Rushton. — Branching Speci- 

 mens of Lyginodendron oldlmmium, Will; Dr. Winilred Brenchley. 

 —A Problem in Weismannism : A. C. F. Morgan.— Note on Sphenofus 

 marsupialis .- Mrs. L. J. Wilsmore. — Polycha:ta of the Indian Ocean, 

 with some Species from the Cape. Verde Islands — The Serpulidse, with a 

 Classificationof the Genera Hydroides and Eupomalus: Miss Helen L. M. 

 Pixell.— Report on the Aiach'nida of ihe Seychelles: S. Hirst.— Gypsina 

 plana. Carter: Miss Marjorie Lindsay. — Niiiduli, Heterocidae: A. 

 Grouvelle. — Fselaphidx de 1'Archipel des Seychelles: A. KafTray.— 

 Anthribidx of the Seychelles: Dr. K. Jordan.— Hispina; from the Sey- 

 chelles: S.Maulik. 



Royal Institution, ; 



CONTENTS. page 



Chemistry of Coal Mining 183 



South African Archaeology 184 



Aspects of the Earth. By Prof. Grenville A. J. Cole 185 



Our Bookshelf 1S6 



Letters to the Editor:— 



An Application of Mathematics to Law. — Harold E. 



Potts 187 



A University in the Tropics. — U. H. Kirkham . . 189 

 The Twinkling of Stars.— Dr. F. W. Edridge- 



Green 189 



Gain of Definition obtained by Moving a Telescope. 



— R. S. Capon ; Alfred J. Lotka . 189 



The New Seismology. By Prof. J. Milne, F.R.S. . 190 



The Problem of Tuberculosis 191 



Notes 192 



Our Astronomical Column : — 



The Solar Union at Bonn 196 



A Case of Large Parallel Proper Motion 196 



The Solar Rotation in 191 1 196 



The Tenth International Geographical Congress 



at Rome 197 



International Meteorology 198 



Nickel Steels in Clock Construction. By Dr. W. 



Rosenhain, F.R.S 200 



Variations of the Spectrum of Titanium in the 



Electric Furnace 200 



Aristotle as a Naturalist. By Prof. W. D'Arcy 



Thompson, C.B 201 



University and Educational Intelligence 204 



Societies and Academies 205 



Books Received 207 



Diary of Societies 208 



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